function DrupalDatabaseCache::isValidBin in Drupal 7

Checks if $this->bin represents a valid cache table.

This check is required to ensure that non-cache tables are not truncated accidentally when calling cache_clear_all().

Return value

boolean

1 call to DrupalDatabaseCache::isValidBin()

DrupalDatabaseCache::clear in includes/cache.inc

Implements DrupalCacheInterface::clear().

File

includes/cache.inc, line 578

Functions and interfaces for cache handling.

Class

DrupalDatabaseCache

Defines a default cache implementation.

Code

function isValidBin() {
  if ($this->bin == 'cache' || substr($this->bin, 0, 6) == 'cache_') {

    // Skip schema check for bins with standard table names.
    return TRUE;
  }

  // These fields are required for any cache table.
  $fields = array(
    'cid',
    'data',
    'expire',
    'created',
    'serialized',
  );

  // Load the table schema.
  $schema = drupal_get_schema($this->bin);

  // Confirm that all fields are present.
  return isset($schema['fields']) && !array_diff($fields, array_keys($schema['fields']));
}